1,720,968 research outputs found
Experimental measurements of spin period in randomly-birefringent spun fibers
No full textWe present a POTDR-based technique to measure the spin period of randomly-birefringent spun fibers. Experimental results are in excellent agreement with the nominal spin periods of ad hoc drawn fibers
Dipole states in stable and unstable nuclei
No full textA nuclear structure model based on linear response theory (i.e., random phase approximation) and which includes pairing
correlations and anharmonicities (coupling with collective vibrations), has been implemented in such a way that it can be applied
on the same footing to magic as well as open-shell nuclei. As applications, we have chosen to study the dipole excitations both
in well known, stable isotopes like 208Pb and 120Sn as well as in the neutron-rich, unstable 132Sn nucleus, by addressing in the
latter case the question about the nature of the low-lying strength. Our results suggest that the model is reliable and predicts in
all cases low-lying strength of non collective nature
Polarization optical fiber sensor for distributed current monitoring
No full textA new technique to distributedly monitor intense current along high energy electric cables is presented and experimentally validated. The new technique is based on the distributed polarization measurement of Rayleigh backscattered light and on Faraday rotation of polarization induced by the electric current owing in the cable. While current monitoring by Faraday rotation in optical fibers is among the first examples of optical fiber sensors, this is the first time, to best of our knowledge, that a distributed current sensor is implemented. Preliminary experimental tests have been performed on a 40-m-long electric cable, with currents varying from 0 kA to 2:5 kA, using standard telecommunication fibers non-optimized to the specific aim. Results confirm the viability of the approach
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Ultra low PMD fibers for long-haul high-capacity systems
No full textWe present a new type of single mode fiber with efficiently reduced and controlled DGD. This task is obtained by means of spinning optimization that allows balancing of the intrinsic fiber birefringence
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